Two of the victims sustained life-threatening injuries after being shot, said Sgt. Greg Stewart, a Portland Police spokesman. Two other people, whose injuries didn't appear to be life-threatening, also were taken to area hospitals.

Stewart said officers aren't seeking anyone in connection with shooting and believe everybody tied to the incident has been "accounted for." No one has yet been arrested in the case, Stewart said.

State business filings show the club was registered in 2009, and Mystic's website advertised its fourth anniversary celebration later this month. Representatives of the business couldn't be reached late Saturday.

Stewart said the identities of the victims will likely be released Sunday pending family notification. He declined to say which hospitals they had been transported to on Saturday night.